What is the Difference Between The First 2 Covid Injections and the Booster(s)?

I cannot find any discernable difference.

If there is no difference would you have taken any injections if you knew you had to take up to 4/5 in a year and a half?

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ChipmunkErnie · 70-79, M

Probably. It's a bit like asking why you'd get a tetanus booster ever 5 or 10 years when it's thew same vaccine--I guess it wears off and you need a boost to your immune system.